This year, with flat design still clearly popular, we have seen a huge rise in popularity of SVG icon sets, with the actual design of the sets being heavily influenced by iOS line-styled icons and Material Design’s subtle style.

The free icon sets are available in many different formats, with SVGs, as mentioned above, heavily represented, but there are also many sets in PSD, AI, EPS and Sketch formats. All of the sets are free to download, and most will allow you to use them in both your personal and commercial projects, but please do check the license before you do use them.